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Registered Member #3215
Joined: Sun Sept 19 2010, 08:42PM
Location:
Posts: 780
what about a twisted wire, or a plane reflector behind the tube, connected to the HV output as if it was the trigger of a stroboscope? pretty same design me thinks...
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
Ash Small wrote ...
...And the unsmoothed 100Hz rectified DC @~100A, 25V wouldn't saturate the core, or anything?
Doesn't matter. The core can't saturate until you've successfully ignited the bulb.
wrote ... what about a twisted wire, or a plane reflector behind the tube, connected to the HV output as if it was the trigger of a stroboscope? pretty same design me thinks...
This gets back to my idea of just zapping it with your handy laboratory Tesla coil.
Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
Steve Conner wrote ...
Ash Small wrote ...
...And the unsmoothed 100Hz rectified DC @~100A, 25V wouldn't saturate the core, or anything?
Doesn't matter. The core can't saturate until you've successfully ignited the bulb.
That's a fair point, Steve, but if it does saturate while the bulb is lit, I assume it will get pretty hot. I'm certainly no expert in these matters, but, apart from wasting energy, how hot will it get? Might it get hot enough to damage the insulation on the 100 amp cable, for example?
I realise that 100Hz is a pretty low frequency, but I'm also aware that a 'DC component' tends to cause cores to saturate, and they can get quite hot, especially if it's got thick, 100 amp cable wrapped around it. I've no idea if this will cause problems here, though, or not.
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
I don't think it will get hot. The ripple frequency is so low. You lose so much energy each time you take the core once around its hysteresis loop, and you're only doing that 100 times per second in this case. If you saturated the core with a steady DC magnetic field, there would be no heat dissipation at all.
Also a ferrite rod core has a huge effective air gap, so it might not even saturate.
Registered Member #3272
Joined: Mon Oct 04 2010, 11:40PM
Location: Beaverton, OR
Posts: 101
I put a 250 watt short arc ultra high pressure mercury lamp in my vacuum chamber to see if it would help outgas water vapor from the system. I used my tig machine to drive it and it worked very well. 75 amps is not much, you might be able to use one of the cheap harbor freight tig machines to do it. The thing you need to watch out for is the duty cycle of the welder. Many cheap machines only have a 20% duty cycle at full output.
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Lets light an 1800W xenon short arc bulb
